/**
 * 计算两地之间的直线距离
 * @param lat1 纬度1
 * @param lon1 经度1
 * @param lat2 纬度2
 * @param lon2 经度2
 */
export function distance(la1, lo1, la2, lo2) {
	var La1 = la1 * Math.PI / 180.0;
	var La2 = la2 * Math.PI / 180.0;
	var La3 = La1 - La2;
	var Lb3 = lo1 * Math.PI / 180.0 - lo2 * Math.PI / 180.0;
	var s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(La3 / 2), 2) + Math.cos(La1) * Math.cos(La2) * Math.pow(Math.sin(
		Lb3 / 2), 2)));
	s = s * 6378.137;
	s = Math.round(s * 10000) / 10000;
	s = s.toFixed(2);
	console.log(s)
	return s;
}
